バッテリ回路を使用する残留バッテリ容量の遠隔測定

摘要

A method of remote sensing a charge includes charging or discharging a capacitor of an RC circuit to a predetermined threshold voltage using a power source. A response signal is provided from a communications module to a handheld computing device comprising a reader system once the capacitor reaches the predetermined threshold voltage. An amount of time taken for the handheld computing device to receive the response signal is determined using a processor. The processor determines charge information using the amount of time.